title: Bis(3-amino-pyrazine-2-carboxyl-ato-κ(2) N (1),O)di-aqua-nickel(II) dihydrate.
abstract: In the title compound, [Ni(C5H4N3O2)2(H2O)2]·2H2O, the Ni(II) ion lies on an inversion center and is coordinated in an slightly distorted octa-hedral environment by two N,O-chelating 3-amino-pyrazine-2-carboxyl-ate (APZC) ligands in the equatorial plane and two trans-axial aqua ligands. In the crystal, O-H⋯O, N-H⋯O and O-H⋯N hydrogen bonds involving the solvent water mol-ecules, aqua and APZC ligands form layers parallel to (010). These layers are linked further via O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds involving the axial aqua ligands, amino groups and the carboxyl-ate groups of the APZC ligands, forming a three-dimensional network.
authors.affiliation: Laboratoire de Chimie Appliquée et Technologie des Matériaux LCATM, Université Oum El Bouaghi, Algeria ; Département Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Université Oum El Bouaghi, Algeria.
authors.forename: Rafika
authors.initials: R
authors.lastname: Bouchene
authors.forename: Amina
authors.initials: A
authors.lastname: Khadri
authors.forename: Sofiane
authors.initials: S
authors.lastname: Bouacida
authors.forename: Fadila
authors.initials: F
authors.lastname: Berrah
authors.forename: Hocine
authors.initials: H
authors.lastname: Merazig